1 # lib-link.m4 serial 7 (gettext-0.15) 2 dnl Copyright (C) 2001-2005 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Bruno Haible. 8 9 AC_PREREQ(2.50) 10 11 dnl AC_LIB_LINKFLAGS(name [, dependencies]) searches for libname and 12 dnl the libraries corresponding to explicit and implicit dependencies. 13 dnl Sets and AC_SUBSTs the LIB${NAME} and LTLIB${NAME} variables and 14 dnl augments the CPPFLAGS variable. 15 AC_DEFUN([AC_LIB_LINKFLAGS], 16 [ 17 AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) 18 AC_REQUIRE([AC_LIB_RPATH]) 19 define([Name],[translit([$1],[./-], [___])]) 20 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], 21 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) 22 AC_CACHE_CHECK([how to link with lib[]$1], [ac_cv_lib[]Name[]_libs], [ 23 AC_LIB_LINKFLAGS_BODY([$1], [$2]) 24 ac_cv_lib[]Name[]_libs="$LIB[]NAME" 25 ac_cv_lib[]Name[]_ltlibs="$LTLIB[]NAME" 26 ac_cv_lib[]Name[]_cppflags="$INC[]NAME" 27 ]) 28 LIB[]NAME="$ac_cv_lib[]Name[]_libs" 29 LTLIB[]NAME="$ac_cv_lib[]Name[]_ltlibs" 30 INC[]NAME="$ac_cv_lib[]Name[]_cppflags" 31 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME) 32 AC_SUBST([LIB]NAME) 33 AC_SUBST([LTLIB]NAME) 34 dnl Also set HAVE_LIB[]NAME so that AC_LIB_HAVE_LINKFLAGS can reuse the 35 dnl results of this search when this library appears as a dependency. 36 HAVE_LIB[]NAME=yes 37 undefine([Name]) 38 undefine([NAME]) 39 ]) 40 41 dnl AC_LIB_HAVE_LINKFLAGS(name, dependencies, includes, testcode) 42 dnl searches for libname and the libraries corresponding to explicit and 43 dnl implicit dependencies, together with the specified include files and 44 dnl the ability to compile and link the specified testcode. If found, it 45 dnl sets and AC_SUBSTs HAVE_LIB${NAME}=yes and the LIB${NAME} and 46 dnl LTLIB${NAME} variables and augments the CPPFLAGS variable, and 47 dnl #defines HAVE_LIB${NAME} to 1. Otherwise, it sets and AC_SUBSTs 48 dnl HAVE_LIB${NAME}=no and LIB${NAME} and LTLIB${NAME} to empty. 49 AC_DEFUN([AC_LIB_HAVE_LINKFLAGS], 50 [ 51 AC_REQUIRE([AC_LIB_PREPARE_PREFIX]) 52 AC_REQUIRE([AC_LIB_RPATH]) 53 define([Name],[translit([$1],[./-], [___])]) 54 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], 55 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) 56 57 dnl Search for lib[]Name and define LIB[]NAME, LTLIB[]NAME and INC[]NAME 58 dnl accordingly. 59 AC_LIB_LINKFLAGS_BODY([$1], [$2]) 60 61 dnl Add $INC[]NAME to CPPFLAGS before performing the following checks, 62 dnl because if the user has installed lib[]Name and not disabled its use 63 dnl via --without-lib[]Name-prefix, he wants to use it. 64 ac_save_CPPFLAGS="$CPPFLAGS" 65 AC_LIB_APPENDTOVAR([CPPFLAGS], [$INC]NAME) 66 67 AC_CACHE_CHECK([for lib[]$1], [ac_cv_lib[]Name], [ 68 ac_save_LIBS="$LIBS" 69 LIBS="$LIBS $LIB[]NAME" 70 AC_TRY_LINK([$3], [$4], [ac_cv_lib[]Name=yes], [ac_cv_lib[]Name=no]) 71 LIBS="$ac_save_LIBS" 72 ]) 73 if test "$ac_cv_lib[]Name" = yes; then 74 HAVE_LIB[]NAME=yes 75 AC_DEFINE([HAVE_LIB]NAME, 1, [Define if you have the $1 library.]) 76 AC_MSG_CHECKING([how to link with lib[]$1]) 77 AC_MSG_RESULT([$LIB[]NAME]) 78 else 79 HAVE_LIB[]NAME=no 80 dnl If $LIB[]NAME didn't lead to a usable library, we don't need 81 dnl $INC[]NAME either. 82 CPPFLAGS="$ac_save_CPPFLAGS" 83 LIB[]NAME= 84 LTLIB[]NAME= 85 fi 86 AC_SUBST([HAVE_LIB]NAME) 87 AC_SUBST([LIB]NAME) 88 AC_SUBST([LTLIB]NAME) 89 undefine([Name]) 90 undefine([NAME]) 91 ]) 92 93 dnl Determine the platform dependent parameters needed to use rpath: 94 dnl libext, shlibext, hardcode_libdir_flag_spec, hardcode_libdir_separator, 95 dnl hardcode_direct, hardcode_minus_L. 96 AC_DEFUN([AC_LIB_RPATH], 97 [ 98 dnl Tell automake >= 1.10 to complain if config.rpath is missing. 99 m4_ifdef([AC_REQUIRE_AUX_FILE], [AC_REQUIRE_AUX_FILE([config.rpath])]) 100 AC_REQUIRE([AC_PROG_CC]) dnl we use $CC, $GCC, $LDFLAGS 101 AC_REQUIRE([AC_LIB_PROG_LD]) dnl we use $LD, $with_gnu_ld 102 AC_REQUIRE([AC_CANONICAL_HOST]) dnl we use $host 103 AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT]) dnl we use $ac_aux_dir 104 AC_CACHE_CHECK([for shared library run path origin], acl_cv_rpath, [ 105 CC="$CC" GCC="$GCC" LDFLAGS="$LDFLAGS" LD="$LD" with_gnu_ld="$with_gnu_ld" \ 106 ${CONFIG_SHELL-/bin/sh} "$ac_aux_dir/config.rpath" "$host" > conftest.sh 107 . ./conftest.sh 108 rm -f ./conftest.sh 109 acl_cv_rpath=done 110 ]) 111 wl="$acl_cv_wl" 112 libext="$acl_cv_libext" 113 shlibext="$acl_cv_shlibext" 114 hardcode_libdir_flag_spec="$acl_cv_hardcode_libdir_flag_spec" 115 hardcode_libdir_separator="$acl_cv_hardcode_libdir_separator" 116 hardcode_direct="$acl_cv_hardcode_direct" 117 hardcode_minus_L="$acl_cv_hardcode_minus_L" 118 dnl Determine whether the user wants rpath handling at all. 119 AC_ARG_ENABLE(rpath, 120 [ --disable-rpath do not hardcode runtime library paths], 121 :, enable_rpath=yes) 122 ]) 123 124 dnl AC_LIB_LINKFLAGS_BODY(name [, dependencies]) searches for libname and 125 dnl the libraries corresponding to explicit and implicit dependencies. 126 dnl Sets the LIB${NAME}, LTLIB${NAME} and INC${NAME} variables. 127 AC_DEFUN([AC_LIB_LINKFLAGS_BODY], 128 [ 129 AC_REQUIRE([AC_LIB_PREPARE_MULTILIB]) 130 define([NAME],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-], 131 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])]) 132 dnl By default, look in $includedir and $libdir. 133 use_additional=yes 134 AC_LIB_WITH_FINAL_PREFIX([ 135 eval additional_includedir=\"$includedir\" 136 eval additional_libdir=\"$libdir\" 137 ]) 138 AC_LIB_ARG_WITH([lib$1-prefix], 139 [ --with-lib$1-prefix[=DIR] search for lib$1 in DIR/include and DIR/lib 140 --without-lib$1-prefix don't search for lib$1 in includedir and libdir], 141 [ 142 if test "X$withval" = "Xno"; then 143 use_additional=no 144 else 145 if test "X$withval" = "X"; then 146 AC_LIB_WITH_FINAL_PREFIX([ 147 eval additional_includedir=\"$includedir\" 148 eval additional_libdir=\"$libdir\" 149 ]) 150 else 151 additional_includedir="$withval/include" 152 additional_libdir="$withval/$acl_libdirstem" 153 fi 154 fi 155 ]) 156 dnl Search the library and its dependencies in $additional_libdir and 157 dnl $LDFLAGS. Using breadth-first-seach. 158 LIB[]NAME= 159 LTLIB[]NAME= 160 INC[]NAME= 161 rpathdirs= 162 ltrpathdirs= 163 names_already_handled= 164 names_next_round='$1 $2' 165 while test -n "$names_next_round"; do 166 names_this_round="$names_next_round" 167 names_next_round= 168 for name in $names_this_round; do 169 already_handled= 170 for n in $names_already_handled; do 171 if test "$n" = "$name"; then 172 already_handled=yes 173 break 174 fi 175 done 176 if test -z "$already_handled"; then 177 names_already_handled="$names_already_handled $name" 178 dnl See if it was already located by an earlier AC_LIB_LINKFLAGS 179 dnl or AC_LIB_HAVE_LINKFLAGS call. 180 uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'` 181 eval value=\"\$HAVE_LIB$uppername\" 182 if test -n "$value"; then 183 if test "$value" = yes; then 184 eval value=\"\$LIB$uppername\" 185 test -z "$value" || LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$value" 186 eval value=\"\$LTLIB$uppername\" 187 test -z "$value" || LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$value" 188 else 189 dnl An earlier call to AC_LIB_HAVE_LINKFLAGS has determined 190 dnl that this library doesn't exist. So just drop it. 191 : 192 fi 193 else 194 dnl Search the library lib$name in $additional_libdir and $LDFLAGS 195 dnl and the already constructed $LIBNAME/$LTLIBNAME. 196 found_dir= 197 found_la= 198 found_so= 199 found_a= 200 if test $use_additional = yes; then 201 if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext"; then 202 found_dir="$additional_libdir" 203 found_so="$additional_libdir/lib$name.$shlibext" 204 if test -f "$additional_libdir/lib$name.la"; then 205 found_la="$additional_libdir/lib$name.la" 206 fi 207 else 208 if test -f "$additional_libdir/lib$name.$libext"; then 209 found_dir="$additional_libdir" 210 found_a="$additional_libdir/lib$name.$libext" 211 if test -f "$additional_libdir/lib$name.la"; then 212 found_la="$additional_libdir/lib$name.la" 213 fi 214 fi 215 fi 216 fi 217 if test "X$found_dir" = "X"; then 218 for x in $LDFLAGS $LTLIB[]NAME; do 219 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 220 case "$x" in 221 -L*) 222 dir=`echo "X$x" | sed -e 's/^X-L//'` 223 if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext"; then 224 found_dir="$dir" 225 found_so="$dir/lib$name.$shlibext" 226 if test -f "$dir/lib$name.la"; then 227 found_la="$dir/lib$name.la" 228 fi 229 else 230 if test -f "$dir/lib$name.$libext"; then 231 found_dir="$dir" 232 found_a="$dir/lib$name.$libext" 233 if test -f "$dir/lib$name.la"; then 234 found_la="$dir/lib$name.la" 235 fi 236 fi 237 fi 238 ;; 239 esac 240 if test "X$found_dir" != "X"; then 241 break 242 fi 243 done 244 fi 245 if test "X$found_dir" != "X"; then 246 dnl Found the library. 247 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$found_dir -l$name" 248 if test "X$found_so" != "X"; then 249 dnl Linking with a shared library. We attempt to hardcode its 250 dnl directory into the executable's runpath, unless it's the 251 dnl standard /usr/lib. 252 if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/$acl_libdirstem"; then 253 dnl No hardcoding is needed. 254 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" 255 else 256 dnl Use an explicit option to hardcode DIR into the resulting 257 dnl binary. 258 dnl Potentially add DIR to ltrpathdirs. 259 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end. 260 haveit= 261 for x in $ltrpathdirs; do 262 if test "X$x" = "X$found_dir"; then 263 haveit=yes 264 break 265 fi 266 done 267 if test -z "$haveit"; then 268 ltrpathdirs="$ltrpathdirs $found_dir" 269 fi 270 dnl The hardcoding into $LIBNAME is system dependent. 271 if test "$hardcode_direct" = yes; then 272 dnl Using DIR/libNAME.so during linking hardcodes DIR into the 273 dnl resulting binary. 274 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" 275 else 276 if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then 277 dnl Use an explicit option to hardcode DIR into the resulting 278 dnl binary. 279 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" 280 dnl Potentially add DIR to rpathdirs. 281 dnl The rpathdirs will be appended to $LIBNAME at the end. 282 haveit= 283 for x in $rpathdirs; do 284 if test "X$x" = "X$found_dir"; then 285 haveit=yes 286 break 287 fi 288 done 289 if test -z "$haveit"; then 290 rpathdirs="$rpathdirs $found_dir" 291 fi 292 else 293 dnl Rely on "-L$found_dir". 294 dnl But don't add it if it's already contained in the LDFLAGS 295 dnl or the already constructed $LIBNAME 296 haveit= 297 for x in $LDFLAGS $LIB[]NAME; do 298 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 299 if test "X$x" = "X-L$found_dir"; then 300 haveit=yes 301 break 302 fi 303 done 304 if test -z "$haveit"; then 305 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir" 306 fi 307 if test "$hardcode_minus_L" != no; then 308 dnl FIXME: Not sure whether we should use 309 dnl "-L$found_dir -l$name" or "-L$found_dir $found_so" 310 dnl here. 311 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_so" 312 else 313 dnl We cannot use $hardcode_runpath_var and LD_RUN_PATH 314 dnl here, because this doesn't fit in flags passed to the 315 dnl compiler. So give up. No hardcoding. This affects only 316 dnl very old systems. 317 dnl FIXME: Not sure whether we should use 318 dnl "-L$found_dir -l$name" or "-L$found_dir $found_so" 319 dnl here. 320 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name" 321 fi 322 fi 323 fi 324 fi 325 else 326 if test "X$found_a" != "X"; then 327 dnl Linking with a static library. 328 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$found_a" 329 else 330 dnl We shouldn't come here, but anyway it's good to have a 331 dnl fallback. 332 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$found_dir -l$name" 333 fi 334 fi 335 dnl Assume the include files are nearby. 336 additional_includedir= 337 case "$found_dir" in 338 */$acl_libdirstem | */$acl_libdirstem/) 339 basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e "s,/$acl_libdirstem/"'*$,,'` 340 additional_includedir="$basedir/include" 341 ;; 342 esac 343 if test "X$additional_includedir" != "X"; then 344 dnl Potentially add $additional_includedir to $INCNAME. 345 dnl But don't add it 346 dnl 1. if it's the standard /usr/include, 347 dnl 2. if it's /usr/local/include and we are using GCC on Linux, 348 dnl 3. if it's already present in $CPPFLAGS or the already 349 dnl constructed $INCNAME, 350 dnl 4. if it doesn't exist as a directory. 351 if test "X$additional_includedir" != "X/usr/include"; then 352 haveit= 353 if test "X$additional_includedir" = "X/usr/local/include"; then 354 if test -n "$GCC"; then 355 case $host_os in 356 linux* | gnu* | k*bsd*-gnu) haveit=yes;; 357 esac 358 fi 359 fi 360 if test -z "$haveit"; then 361 for x in $CPPFLAGS $INC[]NAME; do 362 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 363 if test "X$x" = "X-I$additional_includedir"; then 364 haveit=yes 365 break 366 fi 367 done 368 if test -z "$haveit"; then 369 if test -d "$additional_includedir"; then 370 dnl Really add $additional_includedir to $INCNAME. 371 INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir" 372 fi 373 fi 374 fi 375 fi 376 fi 377 dnl Look for dependencies. 378 if test -n "$found_la"; then 379 dnl Read the .la file. It defines the variables 380 dnl dlname, library_names, old_library, dependency_libs, current, 381 dnl age, revision, installed, dlopen, dlpreopen, libdir. 382 save_libdir="$libdir" 383 case "$found_la" in 384 */* | *\\*) . "$found_la" ;; 385 *) . "./$found_la" ;; 386 esac 387 libdir="$save_libdir" 388 dnl We use only dependency_libs. 389 for dep in $dependency_libs; do 390 case "$dep" in 391 -L*) 392 additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'` 393 dnl Potentially add $additional_libdir to $LIBNAME and $LTLIBNAME. 394 dnl But don't add it 395 dnl 1. if it's the standard /usr/lib, 396 dnl 2. if it's /usr/local/lib and we are using GCC on Linux, 397 dnl 3. if it's already present in $LDFLAGS or the already 398 dnl constructed $LIBNAME, 399 dnl 4. if it doesn't exist as a directory. 400 if test "X$additional_libdir" != "X/usr/$acl_libdirstem"; then 401 haveit= 402 if test "X$additional_libdir" = "X/usr/local/$acl_libdirstem"; then 403 if test -n "$GCC"; then 404 case $host_os in 405 linux* | gnu* | k*bsd*-gnu) haveit=yes;; 406 esac 407 fi 408 fi 409 if test -z "$haveit"; then 410 haveit= 411 for x in $LDFLAGS $LIB[]NAME; do 412 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 413 if test "X$x" = "X-L$additional_libdir"; then 414 haveit=yes 415 break 416 fi 417 done 418 if test -z "$haveit"; then 419 if test -d "$additional_libdir"; then 420 dnl Really add $additional_libdir to $LIBNAME. 421 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-L$additional_libdir" 422 fi 423 fi 424 haveit= 425 for x in $LDFLAGS $LTLIB[]NAME; do 426 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 427 if test "X$x" = "X-L$additional_libdir"; then 428 haveit=yes 429 break 430 fi 431 done 432 if test -z "$haveit"; then 433 if test -d "$additional_libdir"; then 434 dnl Really add $additional_libdir to $LTLIBNAME. 435 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-L$additional_libdir" 436 fi 437 fi 438 fi 439 fi 440 ;; 441 -R*) 442 dir=`echo "X$dep" | sed -e 's/^X-R//'` 443 if test "$enable_rpath" != no; then 444 dnl Potentially add DIR to rpathdirs. 445 dnl The rpathdirs will be appended to $LIBNAME at the end. 446 haveit= 447 for x in $rpathdirs; do 448 if test "X$x" = "X$dir"; then 449 haveit=yes 450 break 451 fi 452 done 453 if test -z "$haveit"; then 454 rpathdirs="$rpathdirs $dir" 455 fi 456 dnl Potentially add DIR to ltrpathdirs. 457 dnl The ltrpathdirs will be appended to $LTLIBNAME at the end. 458 haveit= 459 for x in $ltrpathdirs; do 460 if test "X$x" = "X$dir"; then 461 haveit=yes 462 break 463 fi 464 done 465 if test -z "$haveit"; then 466 ltrpathdirs="$ltrpathdirs $dir" 467 fi 468 fi 469 ;; 470 -l*) 471 dnl Handle this in the next round. 472 names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'` 473 ;; 474 *.la) 475 dnl Handle this in the next round. Throw away the .la's 476 dnl directory; it is already contained in a preceding -L 477 dnl option. 478 names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'` 479 ;; 480 *) 481 dnl Most likely an immediate library name. 482 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$dep" 483 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }$dep" 484 ;; 485 esac 486 done 487 fi 488 else 489 dnl Didn't find the library; assume it is in the system directories 490 dnl known to the linker and runtime loader. (All the system 491 dnl directories known to the linker should also be known to the 492 dnl runtime loader, otherwise the system is severely misconfigured.) 493 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }-l$name" 494 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-l$name" 495 fi 496 fi 497 fi 498 done 499 done 500 if test "X$rpathdirs" != "X"; then 501 if test -n "$hardcode_libdir_separator"; then 502 dnl Weird platform: only the last -rpath option counts, the user must 503 dnl pass all path elements in one option. We can arrange that for a 504 dnl single library, but not when more than one $LIBNAMEs are used. 505 alldirs= 506 for found_dir in $rpathdirs; do 507 alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir" 508 done 509 dnl Note: hardcode_libdir_flag_spec uses $libdir and $wl. 510 acl_save_libdir="$libdir" 511 libdir="$alldirs" 512 eval flag=\"$hardcode_libdir_flag_spec\" 513 libdir="$acl_save_libdir" 514 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag" 515 else 516 dnl The -rpath options are cumulative. 517 for found_dir in $rpathdirs; do 518 acl_save_libdir="$libdir" 519 libdir="$found_dir" 520 eval flag=\"$hardcode_libdir_flag_spec\" 521 libdir="$acl_save_libdir" 522 LIB[]NAME="${LIB[]NAME}${LIB[]NAME:+ }$flag" 523 done 524 fi 525 fi 526 if test "X$ltrpathdirs" != "X"; then 527 dnl When using libtool, the option that works for both libraries and 528 dnl executables is -R. The -R options are cumulative. 529 for found_dir in $ltrpathdirs; do 530 LTLIB[]NAME="${LTLIB[]NAME}${LTLIB[]NAME:+ }-R$found_dir" 531 done 532 fi 533 ]) 534 535 dnl AC_LIB_APPENDTOVAR(VAR, CONTENTS) appends the elements of CONTENTS to VAR, 536 dnl unless already present in VAR. 537 dnl Works only for CPPFLAGS, not for LIB* variables because that sometimes 538 dnl contains two or three consecutive elements that belong together. 539 AC_DEFUN([AC_LIB_APPENDTOVAR], 540 [ 541 for element in [$2]; do 542 haveit= 543 for x in $[$1]; do 544 AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"]) 545 if test "X$x" = "X$element"; then 546 haveit=yes 547 break 548 fi 549 done 550 if test -z "$haveit"; then 551 [$1]="${[$1]}${[$1]:+ }$element" 552 fi 553 done 554 ]) 555
